Portable fan



FIG. 1 is a front perspective view of a portable fan showing my new design;

FIG. 2 is a rear perspective view thereof with the support member shown in an alternation position;

FIG. 3 is a side elevation thereof;

FIG. 4 is a fragmentary bottom perspective thereof with the support omitted; and

FIG. 5 is a front perspective view of a modified form of the portable fan shown in FIG. 1, wherein the modification resides in the omission of the front support bracket. 

The ornamental design for a portable fan, as shown and described. 